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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Automotive Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Automotive Engineers
Editor in Chief :
Volume & Issues
Volume 4, Issue 6 - Dec 1996
Volume 4, Issue 5 - Sep 1996
Volume 4, Issue 4 - Aug 1996
Volume 4, Issue 3 - May 1996
Volume 4, Issue 2 - Mar 1996
Volume 4, Issue 1 - Jan 1996
Selecting the target year
Determination of the Speaker Position and Evaluation of the Audio System of the Passenger Car
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 1~8
The sound quality of the car audio system is affected by the serveral factors such as the dimensions of the room, the boundary condition of the wall, the location of the speakers, etc. Among these factors, the location of the car speakers has been focused to find the best location of the car speakers assuming that the flat response is better. To verify the suggestion, the subjective test is adopted using 10 people. The developed method is utilizd to evaluate the function of the audio system with fixed speaker position.
An Euler Parameter Updating Method for Multibody Kinematics and Dynamics
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 9~17
This paper develops a sequential updating method of the Euler parameter generalized coordinates for the machine kinematics and dynamics, The Newton's method is slightly modified so as to utilize the Jacobian matrix with respect to the virtual rotation instead of this with repect to the Euler parameters. An intermediate variable is introduced and the modified Newton's method solves for the variable first. Relational equation of the intermediate variable is then solved for the Euler parameters. The solution process is carried out efficiently by symoblic inversion of the relational equation of the intermediate variable and the iteration equation of the Euler parameter normalization constraint. The proposed method is applied to a kinematic and dynamic analysis with the Generalized Coordinate Partitioning method. Covergence analysis is performed to guarantee the local convergence of the proposed method. To demonstrate the validity and practicalism of the proposed method, kinematic analysis of a motion base system and dynamic analysis of a vehicle are carried out.
A Study on the Characteristics of Pressure Wave Propagation in Automotive Exhaust System
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 18~26
Based on experimental analysis, the characteristics of pulsating pressure wave propagation is clarified by testing of 4-stroke gasoline engine. The pulsating pressure wave in exhaust system is generated by pulsating gas flow due to working of exhaust valve. The pulsating pressure wave is closely concerned to the loss of engine power according to back pressure and exhaust noise. It is difficult to exactly calculate pulsating pressure wave propagation in exhaust system because of nonlinear effect. Therefore, in the first step for solving these problems, this paper contains experimental model and analysis method which are applied two-port network analysis. Also, it shows coherence function, frequency response function, back pressure, and gradient of temperature in exhaust system.
A Study on the Effects of Suspension Design Parameters on Cornering Performances of a Vehicle
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 27~37
In this paper the effects of suspension design parameters on the steady-state cornering performance of vehicles are studied. To investigate the understeer characteristics of vehicles, steady-state cornering equatons are derived from a two-track model which is expanded from a simple one track model. The effects of the suspension design parameters as well as those of lateral load transfer are taken into consideration. To verify the equation, a skid pad test was carried out with a domestic passenger car. The design parameters of the vehicle are measured using a Suspension Parameter Measuring Device(SPMD). Based on these results, parameter studies are carried out to determine the effect of design parameters on the cornering performance of a vehicle, both in low and high acceleration region.
Effect of Design Parameters of Power Steering System for Passenger Cars on the Vehicle Steering Characteristic
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 38~45
Power steering systems play an important role for the vehicle handling characteristics and driver's steering center feeling during straightforward driving situation. In this paper, the rotary valve, the main component of power steering systems, is modeled and analyzed, and is combined with a 3-DOF(degree of freedom) lateral dynamics model of passenger cars to examine the effects of design parameters on the vehicle steering characteristics. The results can be applied to the development of advanced power steering systems for passenger cars such as electronically-con-trolled power steering system.
The Reduction of Unburned Hydrocarbons on the Direct-Injection Stratified-Charge Combustion Method by Hydrogen Addition
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 46~57
The direct injection stratified charge(DISC) engine enhances the fuel tolerance and the antiknock tendency. This enhanc3d antiknock tendency allows use of a higher compression ratio which results in higher thermal efficiency. But its actual utilization is prevented by high emission combustion time and wall quenching will be the main causes of increasing unburned hydrocarbons in DISC system. In order to solve this problem, small aount of hydrogen was added to the charging air or injected fuel. The effects of hydrogen addition were examined experimentally by radial fuel injection using a pancake-type constant volume bomb. In case of the hydrogen addition to the charge of air, the combustion the amount of hydrogen. In case of the hydrogen addition to the fuel, the combustion pressure was significantly increased.
Modeling of Hydrocarbon Emissions from Spark Ignition Engines
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 58~71
A model which calculates the hydrocarbon emissions from spark ignition engines is presented The model contains the formation of HC emissions due to both crevices around piston ring top land and oil films on the cylinder wall. The model also considers in-cylinder oxidation and exhaust port oxidation of desorbed HC from crevices and oil films after combustion process. The HC emissions model utilizes the results of SI engine cycle simulation. The model predicts well the trends of HC emissions from the engines when varying engine parameters.
Experimental Study of the Non-Uniform Mean Flow at the Front of a Radiator in Engine Room
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 72~79
The recent trend of higher output engines with more auxiliary parts is resulting in greater heat generation in the engine compartment. In order to maximize the heat dissipation and eliminate the inefficient flow in the engine compartment, it is necessary to understand the flow field under the hood. In this respect, experimental study as well as numerical analysis should be conducted. The automated measuring system was constructed to obtain three dimensional mean flow data with high accuracy. The measurements have been made on a vehicle with a steady incoming air flow. The result shows that there exists a high degree of non-uniformity in the mean flow velocity at the front of radiator.
A Study on the Mixture Formation and Combustion Characteristics in Lean Burn Engine
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 80~86
In order to decrease fuel comsumption rate and emissions, lean burn engine which has equipped swirl control valve, is investigated experimentally on the test bench. Single cylinder engine was used to test the combustion and emission performance with 4 kinds of swirl valve. Decrease in the carbon monoxide, hyerocarbon and specific fuel consumption was shown at the lean condition, which means that a good choice of swirl valve on the given intake port geometry can be used to increase the combustion efficiency and lean limit.
Characteristics of the Proportional Pressure Control Valve for 4 Wheel Steering System on the Passenger Car
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 87~96
The proportional pressure control valve(PCV) is an essential component in the open loop controlled rear wheel steering gear of the four wheel steering(4WS) system on the passenger car. The valve should have versatile functions and higher performance. But, it is hard to find the proportional pressure control valve suitable for the 4WS system. In this paper, the determination of the valve parameters was studied by the stability discrimination and the characteristic analysis for the purpose of the development of a new PCV for the 4WS. The mathematical model of the valve was derived from the valve-cylinder system and the programme for numerical computation was developed. The transfer function of the system was obtained from the mathematical model. The characteristics of the valve were inspected through the experiment and compared to those obtained by numerical method. And then the stability discrimination of the system was done by root locus and the analysis of characteristics was done by the developed programme. From the experiment and the analysis of characteristics was done by the developed programme. From the experiment and the inspection, the appropriation of mathematical model and the usefulness of the programme were confirmed. And the parameters which might affect the performance of the valve can be determined by considering the stability discrimination, the characteristics analysis and required functions.
Development of Finite Element Model for impact Human Brain Injury
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 97~106
The impact response of the human brain has been determined by three-dimensional finite element modeling. The model includes a layered shell closely representing the cranial bones with the interior contents occupied by an incompressible contimuum to simulate the brain. Flax and tentorium modeled with 4 node membrane element were also incorporated. The computed pressure-time histories at 4 locations within the brain element compared quite favorably with previously published experimental data from cadaver experiments. A parametric study was subsequently conducted to identify the model response when the impact were varied.
A Study on the Development of Synchromesh in Manual Transmission
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 107~117
The shift feeling, a driver experiences during gear shifting, is a major factor in manual transmission quality. Recently, the shift feeling has becoming more severe every year in proportion to the higher torque and revolution speed of today's automotive engine. In this paper, first, the diagram of a relation between cone angle, sleeve chamfer angle, and friction coefficient of ring is investigated for easy design of Synchromesh system. And then, methodology to solve the shift problems such as clashing noise and rough shift, ect. by analyzing the synchronization procedure in sequence and by investigating the shift waveform if presented.
Numerical Analysis of Three Dimensional Turbulent Flow in a HVAC Duct
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 118~129
In this study, three dimensional flow analysis in a HVAC duct was performed computationally using various turbulence models and compared numerical predictions such as outlet flow split, surface pressure distribution along the duct to experimental data. It's well known that accuracy of computational predictions of flow heavily dependent on turbulent models and discritization method. Therefore, in this work, to assess the ability of turbulent models to predict characteristics of duct flow, three kinds of models, namely standard
, containing parameter for the effect of streamline curvature were employed and validated one another by comparing with experimental data. In results, modified
turbulence model allows a successful prediction of static pressure distribution particulary at around strong curvature but little improvement flow split. In the futrue, adoption of CFD to design HVAC duct with modified
model will bring benefits of producing more accurate prediction, and also give designers more detail information much more than now.
Statistical Analysis of Fatigue Crack Growth Properties for Silicon Carbide Particles Reinforced Metal Matrix Composites
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 130~139
The silicon carbide particles reinforced aluminium 6061(
) composites are generally known have wild range of applications from automobiles to airospaces. But, by the results of existing study for
composites, there are reports that the fatigue life of
composites has improved than
matrixes and has not improved then
matrixes. Consequently, in order to perform the reliable life prediction for
, the properties of probability distribution of fatigue crack initiation life & fracture life, crack growth length in constant number of cycles, crack growth rate in constant stress intensity factor range and m & C value in Paris's fatigue crack growth law and the estimation of statistical parameters have been evaluated by the statistics method.
Development of Close-Coupled Catalyst(CCC) System to Meet EC Stage 2
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 140~146
A large portion(above 70%) fo the hydrocorbon and NOx emissions for a typical vehicle occur mainly before the conventional underbody catalyst reaches activation temperature. To meet the stringent regulation as EC stage 2, the emissions produced during this period must be reduced. One of alternative techniques is to place CCC(Close-Coupled Catalyst) near the exhaust manifold. In this study, the characteristics of CCC are observed through EEC mode.
Influence of Stacking Composition on Fatigue Bending Strenght in CFRP Composite Laminates Subjected to Impact Loading
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 147~155
The purpose of present paper is to estimate the static and fatigue bending strengths of CFRP(carbon fiber reinforced plastic) laminates having impact damage(FOD). The specimens which are formed with the different stacking composition, EPOXY and PEEK matirx and orthotropic and quasi-isotropic laminated plates, are prepared for this experiment. A steel ball is impacted on CFRP laminates, generating impact damages, and the three-point fatigue bending test is carried out by using the impacted laminates to investigate the influence of the stackin composition on the fatigue strength of CFRP laminates.
Fatigue Damage Analysis of the Caliper Housing under ABS Mode
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 156~163
The brakes are the most important safety-critical accident avoidance components of a motor vehicle. They must perform safely under a variety of operating conditions and must have enough strength not to fail during the life of a vehicle. Recently, anti-lock brake systems are used on more and more passenger cars. The ABS brakes modulate brake line pressure to prevent brakes from locking during braking. In this study, finite element analysis, material test for FCD45, measurement of stress and cumulative fatigue damage analysis were performed to evaluate fatigue damage of the caliper housing under ABS mode.
A Study on Emission Reduction by Diesel Oxidation Catalyst in Diesel Engine
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 164~170
Among after treatment devices which reduce exhaust gas of diesel engine, diesel oxidation catalyst(DOC) with high reduction efficiency for gaseous matter and particulate matter is now being studied actively. In this study, an experiment was conducted to analyze the effects on factors of oxidaton characteristics and conversion efficiency of DOC. We tested to estimate change of engine performance whether a 11,000cc diesel engine equipps with DOC or not. We conducted test to estimate the reduction efficiency of exhaust gas in P-5 mode, in D-13 mode of heavy duty diesel regulation mode and in somoke opacity mode for two samples and also we conducted test to analyze the effects about both exhaust gas velocities 1,100rpm and 2,200rpm
Analysis of Mixed Mode Delamination in Graphite/Epoxy Composite
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 171~178
DCB(pure mode I) and CLS(mixed mode) tests were performed to investigate the effect of fracture mode on the interlaminar fracture of composite laminate. Mode I critical strain energy release rate was found to be
from the DCB test and total strain energy release rate decreased from
as thickness ratio(tl/t) varied from 0.333 to 0.667 from the crease from the CLS test. Crack length had no effect on the total strain energy release rate and load was almost constant during the crack growth of the specimen which had the specific thickness ratio. Crack initiated when the stress of the strap ply reached constant stress
which was found to be independent of the thickness ratio.
Numerical Analysis for Linear and Nonlinear Attenuation Characteristics of Exhaust Silencer Systems
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 179~189
An unstructured grid finite-volume method has been applied to predict the linear and nonlinear attenuation characteristics of the expansion chamber silencer system. In order to achieve a grid flexibility and a solution adaptation for geometrically silencer system. In order to achieve a grid flexibility and a solution adaptation for geometrically complex flow regions associated with the actual silencers, the unstructured mesh algorithm in context with the node-centered finite volume method has been employed. The present numerical model has been validated by comparison with the analytical solutions and the experimental data for the acoustic field of the concentric expansion chamber with and without pulsating flows, as well as the axisymmetric blast flowfield with open end. Effects of the chamber geometry on the nonlinear wave attenuation characteristics is discussed in detail.
Error Estimation and Adaptive Time Stepping Procedure for Structural Dynamics
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 190~200
Step-by-step time integration methods are widely used for solving structural dynamics problem. One difficult yet critical choice an analyst must make is to decide an appropriate time step size. The choice of time step size has a significant effect on solution accuracy and computational expense. The objective of this research is to derive error estimate for newly developed time integration method and develop automatic time step size control algorithm for structural dynamics. A formula for computing error tolerance is derived based on desired period resolution. An automatic time step size control strategy is proposed based on a normalized local error estimate for the generalized-α method. Numerical examples demonstrate the developed strategy satisfies general design criteria for time step size control algorithm for dynamic problem.
A Study on the Combustion Characteristics of Methane-air Mixture in Constant Volume Combustion Chamber
Transactions of the Korean Society of Automotive Engineers, volume 4, issue 4, 1996, Pages 201~209
This study describes the combustion characteristics of methance-air mixture with various equivalence retio and initial conditions of mixture in constant volume combustion chamber. Combustion characteristics of methane-air mixture such as combustion pressure, combustion temperature, and heat release were investigated by the measurement of combustion pressure and temperature in the combustion chamber. The results show that maximum combustion pressure, gas temperature and rate of heat release have peaks at equivalence ratio of 1.1. Combustion duration is also the shortest at the equivalence ratio of 1.1 and it is shortened as initial mixture temperature increases.